Description

Details

Opus BT-C3100

The Opus BT-C3100 Intelligent Li-ion/NiCd/NiMH battery charger/analyzer is one of the first battery charger/analyzers that can (quick-)test/refresh/charge/discharge li-ion batteries and do that for NiCd/NiMH batteries too.

Reviews

Customer Reviews

This is the safest charger available due to the fact that the temperature is constantly controlled under each battery slot and also on the PCB. So even if the fan goes down, the charger will stop if overheated.
The Fan is not noisy at all, as written in other comments, and can run at different speed. On top, the fan only runs when higher current is selected on 4 batteries. For instance, charging 4 AA batteries at 300 ma will not heat enough to start the fan
It is the only one showing the real current on top of the selected current, which is the best way to control overcharging. It also stop exactly at maximum 4V2, which is not the case with some other charger i have tested. (Posted on 05-05-19)

I had this charger for about 1,5 years. one slot suddenly didn't read voltages correctly which lead to batteries overcharging and them exploding while out of the charger. It is a tricky fault because there are no signs of fault and it killed me 9 accus until I found out what happened. I checked on a vaping group with several Opus users and ALL broke in the same way after 1,5-2 years and left them with 1-2 accus. Another problem is if you charge 2 accus with 2 amps or 4 with 1 amp the power source gets so hot - almost at melting point so it is not possible to charge at 4 amps total on all slots. (Posted on 19-04-19)

All looks good and dandy, but I cannot have it in my room. It's noisier than my pc. :(

Unacceptable for me. I charge 3 batt. daily, I also have an old efest luc, dead silent, and does its job. I was shopping for vaping batteries and I said I'd throw this in as well as an upgrade... Not the smartest move. At least not for me. It may be way safer and smarter than my actual one, but wont take its place anytime soon.

It might be great for others, but for me it proved to be an overkill and too noisy for my daily needs (under my office). (Posted on 14-11-18)

I got this charger for a bit over two years now (the v2.2 Version with the speed controlled fan). Bought it to supplement my BC-1000 since I need to charge 6-Packs of C-Cells sometimes and 18650 LiIon Batteries.

There are a few things I do not like about it:

- the fan ist still quite noisy, forget about (dis)charging while asleep
- The charger can accept C-Cells (size "Baby"), but only two of them
- you cannot control charge and discharge current at the same time. It can only discharge NiMH with 700mA max, which is too low for my taste.

According to a review it always charges with high current, but PWM - so stress on batteries is higher than with other charging methods. I did not see any negative effects in practice with my eneloops, so it may not matter.

But I have to say, it is the best charger for the money.

- charges NiCd, NiMH and LiIon
- can measure internal resistance, so you can quickly see if a battery is "dead"
- can measure capacity, and do so at different currents (mandatory feature in my opinion)
- can "refresh" cycle, which is useful for NiMH Batteries
- accepts cells larger than AA and 18650
- Power supply is 12V, so easy to find replacement, should it die one day

It is a good universal charger/analyzer, the only real problem is that it is too loud. Also, I would have wished for the charger to accept four C-Cells, not only two.

I struggled between giving 3 and 4 stars because of the noise - but at this price it really deserves a 4 star rating (Posted on 02-10-17)

Charging voltage is regulated to 4.7V instead of 5.0V, thus loading on power adapter when batteries are flat is less. 5.0V charging voltage has problem in regulating the correct current level due to this over loading current on power adapter, which lead to Panasonic brand Li-ion batteries showed wrong charging capacity value ( + 25 percent ). With 4.7V charging voltage, the load on power adapter is greatly reduced and thus can make all types of batteries are charged properly. (Posted on 15-06-15)

1) Charge Li-ION @ 2 Amp And discharge @ 1 Amp
2) Analyze the exact capacity of your Li-ion
3) Made with a new technology ! Chip On Board : the integrated circuit is a raw chip connected directly to the PCB. No more DIP package, expensive soldering, etc
4) New refresh mode can show you batteries capacity, letting you know real magnitude
It is a classic (Posted on 13-06-15)